diff --git a/public/journal.html b/public/journal.html
index e54ed8a..13335c4 100644
--- a/public/journal.html
+++ b/public/journal.html
@@ -183,6 +183,7 @@
       <div class="settings-field"><label>Яркость <span id="enhanceBrightnessVal">100%</span></label><input type="range" id="enhanceBrightness" min="50" max="150" value="100"></div>
       <div class="settings-field"><label>Контраст <span id="enhanceContrastVal">100%</span></label><input type="range" id="enhanceContrast" min="50" max="150" value="100"></div>
       <div class="settings-field"><label>Насыщенность <span id="enhanceSaturateVal">100%</span></label><input type="range" id="enhanceSaturate" min="0" max="200" value="100"></div>
+      <div class="settings-field"><label>Шумодав <span id="enhanceDenoiseVal">0%</span></label><input type="range" id="enhanceDenoise" min="0" max="100" value="0"></div>
       <div class="settings-field"><label>Резкость <span id="enhanceSharpVal">0%</span></label><input type="range" id="enhanceSharp" min="0" max="100" value="0"></div>
     </div>
     <div class="card-foot" style="justify-content:flex-end;gap:8px;margin-top:6px">
diff --git a/public/js/journal.js b/public/js/journal.js
index 600cb17..4cc330d 100644
--- a/public/js/journal.js
+++ b/public/js/journal.js
@@ -422,6 +422,18 @@ let enhanceEntryId = null;
 let enhanceSourceImg = null;
 let enhanceTimer = null;
 let enhanceSaving = false;
+let enhanceEngine = 'auto';
+let enhanceEngineLoaded = false;
+
+async function loadEnhanceEngine() {
+  if (enhanceEngineLoaded) return;
+  enhanceEngineLoaded = true;
+  try {
+    const r = await fetch(`${API}/api/public-settings`);
+    const f = await r.json();
+    if (['auto', 'server', 'client'].includes(f.photo_enhance_engine)) enhanceEngine = f.photo_enhance_engine;
+  } catch (e) {}
+}
 
 function openEnhance(id) {
   const e = currentEntries.find(x => x.id === id);
@@ -463,41 +475,76 @@ function closeEnhance() {
   enhanceSourceImg = null;
 }
 
-function renderEnhancePreview() {
-  if (!enhanceSourceImg) return;
-  const img = enhanceSourceImg;
-  const canvas = document.getElementById('enhanceCanvas');
-  const w = img.naturalWidth;
-  const h = img.naturalHeight;
-  canvas.width = w;
-  canvas.height = h;
-  const ctx = canvas.getContext('2d');
+function medianFilterPass(ctx, w, h) {
+  const data = ctx.getImageData(0, 0, w, h);
+  const src = data.data;
+  const out = new Uint8ClampedArray(src);
+  const row = w * 4;
+  const win = new Array(9);
+  for (let y = 1; y < h - 1; y++) {
+    for (let x = 1; x < w - 1; x++) {
+      const i = y * row + x * 4;
+      for (let ch = 0; ch < 3; ch++) {
+        win[0] = src[i - row - 4 + ch]; win[1] = src[i - row + ch]; win[2] = src[i - row + 4 + ch];
+        win[3] = src[i - 4 + ch]; win[4] = src[i + ch]; win[5] = src[i + 4 + ch];
+        win[6] = src[i + row - 4 + ch]; win[7] = src[i + row + ch]; win[8] = src[i + row + 4 + ch];
+        win.sort((a, b) => a - b);
+        out[i + ch] = win[4];
+      }
+    }
+  }
+  data.data.set(out);
+  ctx.putImageData(data, 0, 0);
+}
+
+function sharpenPass(ctx, w, h, sharp) {
+  const data = ctx.getImageData(0, 0, w, h);
+  const src = data.data;
+  const out = new Uint8ClampedArray(src);
+  const row = w * 4;
+  const a = (sharp / 100) * 1.5;
+  for (let y = 1; y < h - 1; y++) {
+    for (let x = 1; x < w - 1; x++) {
+      const i = y * row + x * 4;
+      for (let ch = 0; ch < 3; ch++) {
+        const v = (1 + 4 * a) * src[i + ch]
+          - a * src[i - 4 + ch] - a * src[i + 4 + ch]
+          - a * src[i - row + ch] - a * src[i + row + ch];
+        out[i + ch] = v;
+      }
+    }
+  }
+  data.data.set(out);
+  ctx.putImageData(data, 0, 0);
+}
+
+function drawEnhanced(ctx, img, w, h) {
   const b = document.getElementById('enhanceBrightness').value;
   const c = document.getElementById('enhanceContrast').value;
   const s = document.getElementById('enhanceSaturate').value;
+  const dn = parseInt(document.getElementById('enhanceDenoise').value, 10);
+  const sp = parseInt(document.getElementById('enhanceSharp').value, 10);
   ctx.filter = `brightness(${b}%) contrast(${c}%) saturate(${s}%)`;
   ctx.drawImage(img, 0, 0, w, h);
   ctx.filter = 'none';
-  const sharp = parseInt(document.getElementById('enhanceSharp').value, 10);
-  if (sharp > 0) {
-    const data = ctx.getImageData(0, 0, w, h);
-    const src = data.data;
-    const out = new Uint8ClampedArray(src);
-    const a = (sharp / 100) * 1.5;
-    for (let y = 1; y < h - 1; y++) {
-      for (let x = 1; x < w - 1; x++) {
-        const i = (y * w + x) * 4;
-        for (let ch = 0; ch < 3; ch++) {
-          const v = (1 + 4 * a) * src[i + ch]
-            - a * src[i - 4 + ch] - a * src[i + 4 + ch]
-            - a * src[i - w * 4 + ch] - a * src[i + w * 4 + ch];
-          out[i + ch] = v;
-        }
-      }
-    }
-    data.data.set(out);
-    ctx.putImageData(data, 0, 0);
+  if (dn > 0) {
+    medianFilterPass(ctx, w, h);
+    if (dn > 70) medianFilterPass(ctx, w, h);
   }
+  if (sp > 0) sharpenPass(ctx, w, h, sp);
+}
+
+function renderEnhancePreview() {
+  if (!enhanceSourceImg) return;
+  const img = enhanceSourceImg;
+  const scale = Math.min(1, 1600 / img.naturalWidth);
+  const w = Math.max(1, Math.round(img.naturalWidth * scale));
+  const h = Math.max(1, Math.round(img.naturalHeight * scale));
+  const canvas = document.getElementById('enhanceCanvas');
+  canvas.width = w;
+  canvas.height = h;
+  const ctx = canvas.getContext('2d');
+  drawEnhanced(ctx, img, w, h);
   canvas.style.display = 'block';
   document.getElementById('enhanceLoading').style.display = 'none';
 }
@@ -506,11 +553,46 @@ function scheduleEnhancePreview() {
   document.getElementById('enhanceBrightnessVal').textContent = document.getElementById('enhanceBrightness').value + '%';
   document.getElementById('enhanceContrastVal').textContent = document.getElementById('enhanceContrast').value + '%';
   document.getElementById('enhanceSaturateVal').textContent = document.getElementById('enhanceSaturate').value + '%';
+  document.getElementById('enhanceDenoiseVal').textContent = document.getElementById('enhanceDenoise').value + '%';
   document.getElementById('enhanceSharpVal').textContent = document.getElementById('enhanceSharp').value + '%';
   if (enhanceTimer) clearTimeout(enhanceTimer);
   enhanceTimer = setTimeout(renderEnhancePreview, 120);
 }
 
+function enhanceParams() {
+  return {
+    brightness: parseInt(document.getElementById('enhanceBrightness').value, 10),
+    contrast: parseInt(document.getElementById('enhanceContrast').value, 10),
+    saturate: parseInt(document.getElementById('enhanceSaturate').value, 10),
+    denoise: parseInt(document.getElementById('enhanceDenoise').value, 10),
+    sharp: parseInt(document.getElementById('enhanceSharp').value, 10),
+  };
+}
+
+function estimateNoise(img) {
+  const aw = 160;
+  const ah = Math.max(1, Math.round(img.naturalHeight * aw / img.naturalWidth));
+  const ac = document.createElement('canvas');
+  ac.width = aw;
+  ac.height = ah;
+  const actx = ac.getContext('2d');
+  actx.drawImage(img, 0, 0, aw, ah);
+  const d = actx.getImageData(0, 0, aw, ah).data;
+  let sum = 0;
+  let n = 0;
+  for (let y = 0; y < ah - 1; y++) {
+    for (let x = 0; x < aw - 1; x++) {
+      const i = (y * aw + x) * 4;
+      const l = 0.299 * d[i] + 0.587 * d[i + 1] + 0.114 * d[i + 2];
+      const lr = 0.299 * d[i + 4] + 0.587 * d[i + 5] + 0.114 * d[i + 6];
+      const lb = 0.299 * d[i + aw * 4] + 0.587 * d[i + aw * 4 + 1] + 0.114 * d[i + aw * 4 + 2];
+      sum += Math.abs(l - lr) + Math.abs(l - lb);
+      n += 2;
+    }
+  }
+  return n ? sum / n : 0;
+}
+
 function autoEnhance() {
   if (!enhanceSourceImg) return;
   const img = enhanceSourceImg;
@@ -546,35 +628,73 @@ function autoEnhance() {
   }
   const contrast = Math.round(Math.min(150, Math.max(100, 25500 / (hi - lo))));
   const brightness = Math.round(Math.min(120, Math.max(85, 12800 / Math.max(1, (lo + hi) / 2))));
+  const noise = estimateNoise(img);
+  let denoise = 0;
+  let sharp = 30;
+  if (noise > 6) {
+    denoise = Math.min(50, Math.round(noise * 6));
+    sharp = 15;
+  }
   const saturate = 106;
-  const sharp = 30;
   document.getElementById('enhanceBrightness').value = brightness;
   document.getElementById('enhanceContrast').value = contrast;
   document.getElementById('enhanceSaturate').value = saturate;
+  document.getElementById('enhanceDenoise').value = denoise;
   document.getElementById('enhanceSharp').value = sharp;
   scheduleEnhancePreview();
 }
 
 async function saveEnhance() {
   if (!enhanceEntryId || !enhanceSourceImg || enhanceSaving) return;
-  const canvas = document.getElementById('enhanceCanvas');
-  enhanceSaving = true;
+  await loadEnhanceEngine();
   const btn = document.getElementById('enhanceSaveBtn');
+  enhanceSaving = true;
   btn.disabled = true;
   btn.textContent = 'Сохранение...';
+  const entryId = enhanceEntryId;
   try {
-    const blob = await new Promise((resolve, reject) => canvas.toBlob(b => b ? resolve(b) : reject(new Error('toBlob failed')), 'image/jpeg', 0.92));
-    const fd = new FormData();
-    fd.append('photo', blob, 'enhanced.jpg');
-    const res = await fetch(`${API}/api/entries/${enhanceEntryId}/photo/enhance`, { method: 'PUT', headers: hdr(), body: fd });
-    if (!res.ok) {
-      const err = await res.json().catch(() => ({}));
-      throw new Error(err.error || 'Ошибка сохранения');
+    let done = false;
+    let engineLabel = 'клиент';
+    if (enhanceEngine !== 'client') {
+      try {
+        const ctrl = new AbortController();
+        const timer = setTimeout(() => ctrl.abort(), 8000);
+        const res = await fetch(`${API}/api/entries/${entryId}/photo/enhance`, {
+          method: 'PUT',
+          headers: hdrJson(),
+          body: JSON.stringify({ params: enhanceParams() }),
+          signal: ctrl.signal,
+        });
+        clearTimeout(timer);
+        if (!res.ok) {
+          const err = await res.json().catch(() => ({}));
+          throw new Error(err.error || 'Ошибка сервера');
+        }
+        engineLabel = 'сервер';
+        done = true;
+      } catch (e) {
+        if (enhanceEngine === 'server') throw e;
+      }
     }
-    const savedId = enhanceEntryId;
-    showToast('Фото улучшено и сохранено');
+    if (!done) {
+      const img = enhanceSourceImg;
+      const canvas = document.createElement('canvas');
+      canvas.width = img.naturalWidth;
+      canvas.height = img.naturalHeight;
+      const ctx = canvas.getContext('2d');
+      drawEnhanced(ctx, img, canvas.width, canvas.height);
+      const blob = await new Promise((resolve, reject) => canvas.toBlob(b => b ? resolve(b) : reject(new Error('toBlob failed')), 'image/jpeg', 0.92));
+      const fd = new FormData();
+      fd.append('photo', blob, 'enhanced.jpg');
+      const res = await fetch(`${API}/api/entries/${entryId}/photo/enhance`, { method: 'PUT', headers: hdr(), body: fd });
+      if (!res.ok) {
+        const err = await res.json().catch(() => ({}));
+        throw new Error(err.error || 'Ошибка сохранения');
+      }
+    }
+    showToast(`Фото улучшено (${engineLabel}) и сохранено`);
     closeEnhance();
-    refreshEntryCard(savedId);
+    refreshEntryCard(entryId);
   } catch (e) {
     alert(e.message);
   } finally {
@@ -937,6 +1057,7 @@ document.getElementById('enhanceModal').addEventListener('click', e => { if (e.t
 document.getElementById('enhanceBrightness').addEventListener('input', scheduleEnhancePreview);
 document.getElementById('enhanceContrast').addEventListener('input', scheduleEnhancePreview);
 document.getElementById('enhanceSaturate').addEventListener('input', scheduleEnhancePreview);
+document.getElementById('enhanceDenoise').addEventListener('input', scheduleEnhancePreview);
 document.getElementById('enhanceSharp').addEventListener('input', scheduleEnhancePreview);
 document.getElementById('aiAcceptBtn').addEventListener('click', acceptAiCorrect);
 document.getElementById('aiRejectBtn').addEventListener('click', closeAiCorrect);
diff --git a/public/js/settings.js b/public/js/settings.js
index 38f8fcc..030c456 100644
--- a/public/js/settings.js
+++ b/public/js/settings.js
@@ -1,4 +1,4 @@
-const DIRTY_FIELDS = ['spamInterval', 'footerLeft', 'footerRight', 'aiPrompt', 'aiAutoCheck', 'shareShowMessage', 'shareShowDate', 'shareShowNames', 'shareShowPhotos', 'cookieNoticeText', 'photoResolution', 'photoQuality'];
+const DIRTY_FIELDS = ['spamInterval', 'footerLeft', 'footerRight', 'aiPrompt', 'aiAutoCheck', 'shareShowMessage', 'shareShowDate', 'shareShowNames', 'shareShowPhotos', 'cookieNoticeText', 'photoResolution', 'photoQuality', 'photoEngine'];
 const SECTION_IDS = ['sec-system', 'sec-antispam', 'sec-share', 'sec-form', 'sec-ai', 'sec-backup', 'sec-bans'];
 const SPAM_MAX = 10080;
 const BAN_REASONS = {
@@ -157,6 +157,9 @@ async function loadSettings() {
   if (s.photo_capture_resolution) pr.value = s.photo_capture_resolution;
   if (!pr.value) pr.value = '640x480';
   document.getElementById('photoQuality').value = s.photo_capture_quality !== undefined && s.photo_capture_quality !== '' ? s.photo_capture_quality : '0.92';
+  const pe = document.getElementById('photoEngine');
+  pe.value = ['auto', 'server', 'client'].includes(s.photo_enhance_engine) ? s.photo_enhance_engine : 'auto';
+  if (!pe.value) pe.value = 'auto';
   snapshotDirty();
   updateSpamUi();
   loadAiQueue();
@@ -496,6 +499,7 @@ async function saveSettings() {
         cookie_notice_text: document.getElementById('cookieNoticeText').value.trim(),
         photo_capture_resolution: document.getElementById('photoResolution').value,
         photo_capture_quality: String(document.getElementById('photoQuality').value),
+        photo_enhance_engine: document.getElementById('photoEngine').value,
       } })
     });
     if (res.ok) {
diff --git a/public/settings.html b/public/settings.html
index 85eb262..098b110 100644
--- a/public/settings.html
+++ b/public/settings.html
@@ -194,6 +194,15 @@
             </div>
             <span class="hint">Больше значение — лучше качество и крупнее файл</span>
           </div>
+          <div class="settings-field">
+            <label for="photoEngine">Обработка улучшения фото</label>
+            <select id="photoEngine" class="settings-input">
+              <option value="auto">Авто (сервер, иначе клиент)</option>
+              <option value="server">Сервер (sharp)</option>
+              <option value="client">Клиент (браузер)</option>
+            </select>
+            <span class="hint">Серверный режим обрабатывает оригинал без пережатия и быстрее на больших фото</span>
+          </div>
         </div>
       </div>
 
diff --git a/server.js b/server.js
index 24e8472..82f0f22 100644
--- a/server.js
+++ b/server.js
@@ -965,8 +965,8 @@ app.get('/api/settings', requireAdmin, async (_, res) => {
 
 app.get('/api/public-settings', apiLimiter, async (_, res) => {
   const out = await cacheWrap('public-settings', PUBLIC_TTL_MS, async () => {
-    const keys = ['footer_left', 'footer_right', 'share_show_student_message', 'share_show_entry_date', 'share_show_student_names', 'share_show_group_photos', 'cookie_notice_text', 'spam_interval_min', 'photo_capture_resolution', 'photo_capture_quality'];
-    const defaults = { spam_interval_min: '30', photo_capture_resolution: '640x480', photo_capture_quality: '0.92' };
+    const keys = ['footer_left', 'footer_right', 'share_show_student_message', 'share_show_entry_date', 'share_show_student_names', 'share_show_group_photos', 'cookie_notice_text', 'spam_interval_min', 'photo_capture_resolution', 'photo_capture_quality', 'photo_enhance_engine'];
+    const defaults = { spam_interval_min: '30', photo_capture_resolution: '640x480', photo_capture_quality: '0.92', photo_enhance_engine: 'auto' };
     const result = {};
     for (const k of keys) result[k] = await getSetting(k, defaults[k] || '');
     const rm = /^(\d{2,5})x(\d{2,5})$/.exec(result.photo_capture_resolution);
@@ -1005,6 +1005,9 @@ app.put('/api/settings', requireAdmin, async (req, res) => {
         return res.status(400).json({ error: 'photo_capture_quality должен быть числом от 0.5 до 1' });
       }
     }
+    if (key === 'photo_enhance_engine' && !['auto', 'server', 'client'].includes(String(value))) {
+      return res.status(400).json({ error: 'photo_enhance_engine должен быть auto, server или client' });
+    }
   }
   const client = await pool.connect();
   try {
@@ -3662,7 +3665,25 @@ app.put('/api/entries/:id/photos/:photoId/main', requireAuth, async (req, res) =
   invalidateEntries();
   res.json({ ok: true, photo_path: rows[0].photo_path });
 });
-app.put('/api/entries/:id/photo/enhance', requireAuth, (req, res, next) => { upload.single('photo')(req, res, next); }, async (req, res) => {
+function clampEnhanceParam(v, min, max, def) {
+  const n = parseFloat(v);
+  return Number.isFinite(n) ? Math.min(max, Math.max(min, n)) : def;
+}
+
+async function swapEntryPhotoFiles(req, entryId, oldPath, newPath) {
+  await pool.query('UPDATE entries SET photo_path = $1 WHERE id = $2', [newPath, entryId]);
+  await pool.query('UPDATE entry_photos SET photo_path = $1 WHERE entry_id = $2 AND photo_path = $3', [newPath, entryId, oldPath]);
+  safeUnlink(oldPath);
+  const oldThumb = path.join('uploads', '.thumbs', path.basename(oldPath).replace(/\.[^.]+$/, '') + '.webp');
+  safeUnlink(oldThumb);
+  await logAudit(req, 'entry.photo.enhance', { entry_id: entryId, old_path: oldPath, new_path: newPath });
+  invalidateEntries();
+}
+
+app.put('/api/entries/:id/photo/enhance', requireAuth, (req, res, next) => {
+  if (req.is('json')) return next();
+  upload.single('photo')(req, res, next);
+}, async (req, res) => {
   if (req.user.role !== 'admin') {
     const acc = await entryAccessible(req.user, req.params.id);
     if (!acc.found) return res.status(404).json({ error: 'Not found' });
@@ -3679,17 +3700,39 @@ app.put('/api/entries/:id/photo/enhance', requireAuth, (req, res, next) => { upl
       if (req.file) safeUnlink(req.file.path);
       return res.status(400).json({ error: 'У записи нет фото' });
     }
-    if (!req.file) return res.status(400).json({ error: 'Нет файла' });
-    await convertPhoto(req.file);
-    const newPath = `/uploads/${req.file.filename}`;
-    await pool.query('UPDATE entries SET photo_path = $1 WHERE id = $2', [newPath, req.params.id]);
-    await pool.query('UPDATE entry_photos SET photo_path = $1 WHERE entry_id = $2 AND photo_path = $3', [newPath, req.params.id, oldPath]);
-    safeUnlink(oldPath);
-    const oldThumb = path.join('uploads', '.thumbs', path.basename(oldPath).replace(/\.[^.]+$/, '') + '.webp');
-    safeUnlink(oldThumb);
-    await logAudit(req, 'entry.photo.enhance', { entry_id: req.params.id, old_path: oldPath, new_path: newPath });
-    invalidateEntries();
-    res.json({ ok: true, photo_path: newPath });
+    let newPath;
+    let engine = 'client';
+    if (req.is('json')) {
+      if (!sharp) return res.status(503).json({ error: 'sharp недоступен на сервере' });
+      const p = req.body.params || {};
+      const brightness = clampEnhanceParam(p.brightness, 10, 300, 100);
+      const contrast = clampEnhanceParam(p.contrast, 10, 300, 100);
+      const saturate = clampEnhanceParam(p.saturate, 0, 300, 100);
+      const sharpAmt = clampEnhanceParam(p.sharp, 0, 100, 0);
+      const denoise = clampEnhanceParam(p.denoise, 0, 100, 0);
+      const srcPath = path.join(__dirname, oldPath.replace(/^\/+/, ''));
+      let pipeline = sharp(srcPath).rotate();
+      if (denoise > 0) pipeline = pipeline.median(denoise > 70 ? 5 : 3);
+      pipeline = pipeline.modulate({ brightness: brightness / 100, saturation: saturate / 100 });
+      if (contrast !== 100) {
+        const a = contrast / 100;
+        pipeline = pipeline.linear(a, 128 * (1 - a));
+      }
+      if (sharpAmt > 0) {
+        pipeline = pipeline.sharpen({ sigma: 0.5 + (sharpAmt / 100) * 1.5, m1: 0, m2: 1 + sharpAmt / 50 });
+      }
+      const newName = crypto.randomBytes(12).toString('hex') + '.jpg';
+      const outPath = path.join(__dirname, 'uploads', newName);
+      await pipeline.jpeg({ quality: 92, mozjpeg: true }).toFile(outPath);
+      newPath = `/uploads/${newName}`;
+      engine = 'sharp';
+    } else {
+      if (!req.file) return res.status(400).json({ error: 'Нет файла' });
+      await convertPhoto(req.file);
+      newPath = `/uploads/${req.file.filename}`;
+    }
+    await swapEntryPhotoFiles(req, req.params.id, oldPath, newPath);
+    res.json({ ok: true, photo_path: newPath, engine });
   } catch (e) {
     if (req.file) safeUnlink(req.file.path);
     console.error('PUT /api/entries/:id/photo/enhance:', e);